Depends on what you're working on. Different years and different series (F1-6) have different size king pins.

 

48-52 F-1/2/3: dia. = .814" reamer #5155 (~13/16")
The FOMOCO part# for the reamer is: T53T-3110-A

According to the 56 ford truck shop manual the 53-56 F-100 bushing is 0.861 ID and the spindle bolt is 0.859 OD

 

Thanks for that data!
Greg

 

I just got an email that my king pin set arrived at my house. I called a couple of shops and they both estimated $100 to press in bushings and ream.
I was pondering finding an adjustable hand reamer and doing it myself, but I worry about getting the correct size.
Would it be worthwhile to remove the old bushings myself? I thought about pressing the new ones in myself as well, but above it's mentioned you should press in and ream one before doing the second. Probably just safer to have experts do this job. Gotta get rid of that shimmy at 60. Steering box after king pins.

I know as soon as I start tearing everything apart, I will need to use the truck.